Jan. 1906] 
Cultures of Uredineae in 1905 
17 
sown on Erysimum asperum, Sophia incisia, 17 Lepidium Virgini- 
cum, and Bursa Bursa-pastoris, with success in each case. The 
sowing was made April 18, and spermogonia appeared on Eryisi- 
mum and Sophia April 25, Lepidium April 26, and Bursa April 
27, while aecidia were observed on all by May 8. The aecidia 
develop with considerable difficulty on Bursa , and Rev. Bates 
writes that they are not common or abundant in the field on 
this host. On Lepidium they also start with less ease than 
on the other species, but under good conditions grow well. 18 
14. Puccinia poculiformis (Jacq.) Wettst. — Teleuto- 
sporic material on Agrostis alba , sent from Ithaca, N. Y., by 
Mr. Jackson, was sown on Berberis vulgaris April 13, and 
showed numerous spermogonia April 22, with abundance of 
aecidia May 4. 
15. Puccinia Sorghi Schw. — The work of last year, 19 in 
which only aecidia were used, was verified this season by sowing 
teleutospores. The material was obtained in Lafayette from an 
early garden variety of sweet corn. It was sown April 17 on 
Oxalis cymosa (the common wild wood sorrel of the region), 
0 . Ortgiesii (a yellow-flowered greenhouse weed), O. -, 
(a tuberous pink-flowered form of greenhouses), and O. Bowiei 
(a pink-flowered form with large flowers and leaves, also grown 
in greenhouses.) All remained free, except O. cymosa , which 
showed numerous spermogonia on April 27, and aecidia on May 
5. A second sowing was made May 1 on O. cymosa , O. Origiesii, 
O. Bowiei, and O. corniculata (growing out of doors over a grass- 
covered conduit for steam pipes), and again all remained free ex¬ 
cept O. cymosa , which gave spermogonia May 8, and eacidia May 
14. It is not apparent why no infection should occur on the four 
hosts other than O. cymosa , but there is no reason to suppose 
that it was due in any degree to lack of vigor or suitable con¬ 
ditions. 
The aecidiospores raised in the first trial above were sown 
May 6 on seedlings of the yellow dent field corn variety of Zea 
Mays, and in a week, May 13, showed uredospores, which 
increased in abundance until teleutospores were observed June 15. 
The uredospores from this culture (on yellow dent corn) were 
sown May 16 on small plants of garden sweet corn, and gave 
17 This is probably not the correct name of the plant used for the 
cultures. It is, however, the name also used last year for the trial host, 
which is the common species of Sophia in this region, and the error in 
determination is due to the confusion existing in the current manuals. 
The species is also different from the one on which the fungus was col¬ 
lected last year in Nebraska by Rev. Bates (Jour. Mycol. 11 : 116. 1905), 
and that is also incorrectly named. But for the sake of simplicity the 
name 3*. incisa will be used in this article for both species. 
18 For previous cultures see Bot. Gaz. 55:19. 1903; and Jour. 
Mycol. 11 : 54. 1905. 
18 Bot. Gaz. 5^:64. 1904. 
